Depth Strider 2 and Respiration 2 are very op in PVP. Please remove them or at least downgrade to Level 1. With Depth Strider you can out run everything else even boats on water, I once got reported for "cheating" when I was using flippers last map because they thought I was running on water to catch up to them in pvp. And Pvp in minecraft means that if you're below another player you've got 1 block longer range advantage as you can hit the player's bottom half of the hitbox, this makes Respiration OP as you can stay underwater longer.
Also you should probably make a reminder that you can't use soulbound armour pieces, or even put soulbound items in your e-chest or chests in general. @Sporadic
Additionally you could add Curse of Vanishing on these items so people can't loot them to make them shop exclusive.